Add support for regional secret version datasource google_secret_manager_regional_secret_version

[modular-magician]

Add support for new regional secret version datasource google_secret_manager_regional_secret_version.
Add support for version_aliases field in google_secret_manager_regional_secret resource.
More info about regional secrets: https://cloud.google.com/secret-manager/docs/regional-secrets-overview

This PR depends on the PR #11699

Notes:

1. As of now, the API reference of the regional secret versions are being documented on GCP docs side. Hence, the link mentioned in the website/docs/d/secret_manager_regional_secret_version.html.markdown file will be updated later.
2. We will might also need to change the reference of the terraform registry provided for google_secret_manager_regional_secret_version_access datasource in the datasource description section in the website/docs/d/secret_manager_regional_secret_version.html.markdown file.

Release Note Template for Downstream PRs (will be copied)

`google_secret_manager_regional_secret_version`

secretmanagerregional: added `version_aliases` field to `google_secret_manager_regional_secret` resource

Derived from GoogleCloudPlatform/magic-modules#11730

[github-actions]

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